Cannot charge iPhone via non-computer USB

My iPhone charges fine when plugged into a computer or when the cable is plugged into the AC brick that came with the phone. However, I have a few other power sources with USB jacks that the iPhone seems to not charge on. A 30 GB iPod does charge on these devices.
One example is a Xantrex Xpower Powersource Mobile Mini. It's one of those pocket size things with a Li battery inside that can be charged by AC or DC (car). It has a USB port that then provides 5V for charging cell phones, etc. The device works: it charges a 30 GB iPod and RAZR phone with no problems. When I plug in the iPhone, the iPhone does not show the charging battery.
Is this known behavior? Does the iPhone expect the data lines on a USB port to be "official"? The spec shows pull up/down resistors on both. The AC brick from Apple might include these to keep its port in spec????
Anyone having similar issues?
TIA

Thanks for the reply, even if it is less than encouraging.
We do use an inverter in the car sometimes, and I have another semi-portable power source with a built-in inverter that we use the AC brick. However, the Mobile Mini (similar in intent to Griffin TuneJuice sold in Apple's on-line store) is for extended power on airplanes, trains, buses, etc., where there may not be a power source and where the device is especially useful for passing time.
Question: does iPod touch has similar behavior?

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Cannot charge iPhone via non-computer USB

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